What muffler(s) for stock Corvette-like sound
 

I have a nearly stock LS1 in a 68 Camaro. Hedman headers to 2.5" with Flowmaster 40's. No cross-over. 45° turndowns exit just below the taillight panel. Idle and cruising is OK, but WOT is too loud for my taste. It's my daily driver and I find myself avoiding WOT only to avoid the sound. Female passengers are frequently turned-off, too..... a huge problem, obviously.

I have room to add a second SMALL inline muffler or replace the Flowmasters.

Any suggestions for a much much quieter sound. Factory Corvette sound level would be awesome.